Acta Photonica Sinica, Volume. 42, Issue 8, 936(2013)
Improved Transmission Performance for Intensity Modulation and Direct Detection Baseband Optical Double Side Band Orthogonal Frequency Division Multiplexing Systems with an Preprocessing Technique
In order to reduce the performance impairments of directdetection optical orthogonal frequencydivision multiplexing (DDOOFDM) system caused by the nonlinear effects of electroopitc modulator and fiber chromatic dispersion, the impairment mechanisms are analyzed theoretically. Based on the analysis results, a digital preprocessing technique which combined predistortion and preemphasis methods to combat the nonlinearity and power fading, respectively, is proposed to employ to OFDM transmitter to improve the system's performance. The proposed method is verified by numerical simulation. The simulation results show that error vector magnitude (EVM) of the received signal can obtain a 2 dB improvement when both modulation indexes are optimum, compared to without employing the predistortion technique at the optical backtoback transmission case. With the increasing of optical fiber transmission distance, the power of high freqency subcarriers of the received OFDM signal is attenuated severely, then the BER performace of the system is deteriorated dramatically. The sensitivity of OFDM receiver can be improved significantly with the proposed digital preprocessing technique with low computational complexity.
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GUO Tianguang, CHEN Lin, CHEN Ming, WU Wei. Improved Transmission Performance for Intensity Modulation and Direct Detection Baseband Optical Double Side Band Orthogonal Frequency Division Multiplexing Systems with an Preprocessing Technique[J]. Acta Photonica Sinica, 2013, 42(8): 936
Received: Sep. 14, 2012
Accepted: --
Published Online: Sep. 25, 2013
The Author Email: Tianguang GUO (guotianguang@yahoo.cn)